I've been trying to see if there was ever a way to capture raw RGB with Sync on Octane. (Or even SCART for that matter) I have been looking at various XIOs for video but I haven't come across quite what I've been looking for.

Octane video options are either low end (composite analog: Personal Video), or high end (digital: SDI and HD-SDI).

So you're probably going to need an RBG-to-(HD)SDI converter, maybe an AJA HD10A or similar? You didn't tell us the source of your RGB, if it's not broadcast video but VGA or RGB workstation output you may need something else.

An Octane1 Digital Video board has SDI input/output,An Octane2 DM2 with VBOB has HD-SDI input/output (this can be rather pricey).

Finally, it's possible to use an Onyx2 DIVO card in an Octane (if you replace the XIO latch with an Octane style latch). It provides SDI input/output. I have one of those left for sale and can replace the latch.

To accentuate the special identity of the IRIS 4D/70, Silicon Graphics' designers selected a new color palette. The machine's coating blends dark grey, raspberry and beige colors into a pleasing harmony. (IRIS 4D/70 Superworkstation Technical Report)

Thanks- this all makes sense. So SDI is really my only option and converting analog RGB to SDI is not worth the price of admission in this case, its just for some preservation stuff at home. I guess I can still use the Octane for editing and just capture on a PC.